General Pathology — MCQs

General Pathology Indian Medical PG Practice Questions and MCQs

Question 1371: Virchow method of organ removal is:

A. In situ dissection
B. Organs removed en masse
C. Organs removed en bloc
D. Organs removed one by one (Correct Answer)

Explanation: ***Organs removed one by one*** - The **Virchow method** is characterized by the sequential removal of **individual organs** through a systematic dissection. - This technique allows for detailed inspection and measurement of each organ independently, which can be useful for identifying specific pathologies confined to single structures. *In situ dissection* - This method involves dissecting and examining organs **within the body cavity before removal**, which is not the primary characteristic of the Virchow method. - While some dissection occurs *in situ*, the essential principle of Virchow's method is the **separate extraction** of organs. *Organs removed en masse* - This describes the **Ghon method**, where organs are removed in three blocks (thoracic, abdominal-gastrointestinal, and genitourinary) and then dissected. - This method aims to preserve anatomical relationships between organs, which contrasts with the single-organ focus of the Virchow method. *Organs removed en bloc* - This term generally refers to removing organs in **several blocks or groups** (similar to the Ghon method), maintaining some anatomical connections. - It does not involve the individual removal of each organ, which is the defining feature of the Virchow technique.

Question 1372: Caspases are involved in -

A. Cell signaling
B. Cell injury
C. Apoptosis (Correct Answer)
D. Pinocytosis

Explanation: ***Apoptosis*** - **Caspases** are a family of **proteases** that play a crucial role as executioners of programmed cell death, or **apoptosis** [1]. - They are activated in a cascade and systematically dismantle the cell's components, leading to its controlled demise without causing inflammation [1]. *Cell signaling* - While some caspases can participate in limited proteolysis events related to cell signaling, their primary and defining role is not general cell signaling pathways. - Cell signaling involves a vast array of molecules like kinases, G proteins, and receptors, which are distinct from the caspase proteolytic cascade. *Cell injury* - **Cell injury** can lead to cell death, but it encompasses both **apoptosis** and **necrosis**. Caspases are specifically involved in the controlled process of apoptosis, not the chaotic disintegration of necrosis [1]. - Necrosis is often characterized by cell swelling, rupture, and inflammation, which are distinct from the caspase-mediated process [2]. *Pinocytosis* - **Pinocytosis**, also known as cell drinking, is a form of **endocytosis** where the cell engulfs extracellular fluid and its dissolved contents. - This process is mediated by the cell membrane and cytoskeleton, and caspases have no known direct role in pinocytosis. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 64-65. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, p. 71.

Question 1373: All of the following are features of somatic death, except:

A. Cessation of heart activity (Correct Answer)
B. Cessation of respiration
C. Non-responding muscles
D. No response to external stimuli

Explanation: ***Cessation of heart activity*** - While central to the definition of **somatic/clinical death**, heart activity can sometimes be restored even after a brief cessation, especially with modern cardiopulmonary resuscitation techniques. [1] - This represents **potentially reversible clinical death** rather than an absolute irreversible feature, distinguishing it from true permanent somatic death. [1] - The key distinction is that **cardiac arrest** alone does not define irreversible death if circulation can be restored before widespread cellular damage occurs. *Cessation of respiration* - This is a definitive feature of **somatic death**, representing the irreversible cessation of breathing and gas exchange. [1] - Respiratory arrest leads to **anoxia** and hypoxia, rapidly causing widespread cellular damage throughout the body. - Permanent cessation of respiration is one of the classical signs of death. [1] *Non-responding muscles* - **Muscle flaccidity** and absence of response to stimuli indicate loss of neural control and ATP depletion in muscle cells, characteristic of somatic death. [1] - This progresses through stages including primary flaccidity, rigor mortis, and secondary flaccidity as post-mortem changes occur. - Complete unresponsiveness of muscles to external stimuli confirms death. *No response to external stimuli* - Complete absence of response to external stimuli indicates **loss of brainstem reflexes** and cortical function, confirming somatic death. [1] - This includes absence of pupillary reflexes, corneal reflexes, and withdrawal responses to painful stimuli. - The irreversible loss of all neurological responses is a critical component of determining death. [1] **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 247-248.

Question 1374: Which of the following is a cause of Hirschsprung disease in a patient?

A. Failure of involution of vitelline duct
B. Failure of migration of neural crest cells (Correct Answer)
C. Excessive peristalsis of the affected part of the gut
D. Obstruction secondary to an infectious agent

Explanation: ***Failure of migration of neural crest cells*** - Hirschsprung disease is characterized by the absence of **ganglion cells** (Auerbach and Meissner plexuses) in the distal colon [1]. - This aganglionosis results from the failure of **neural crest cells** to migrate completely from the esophagus to the anus during embryonic development [1]. *Failure of involution of vitelline duct* - This condition is associated with **Meckel's diverticulum**, which is a remnant of the vitelline duct, not Hirschsprung disease. - **Meckel's diverticulum** can cause symptoms like GI bleeding or obstruction, but it does not involve aganglionosis of the colon. *Excessive peristalsis of the affected part of the gut* - Hirschsprung disease is characterized by a **lack of peristalsis** in the aganglionic segment, leading to functional obstruction [1]. - The healthy, proximal colon may show increased peristalsis in an attempt to overcome the obstruction, but the affected segment itself is aperistaltic. *Obstruction secondary to an infectious agent* - Obstruction due to an infectious agent is typically related to **inflammatory processes** or strictures caused by infections (e.g., severe colitis). - This mechanism of obstruction does not involve the **developmental anomaly** of missing ganglion cells, which is central to Hirschsprung disease. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 94-95.

Question 1375: Lendrum's stain is done for:

A. Air embolism
B. Pulmonary embolism
C. Fat embolism
D. Amniotic fluid embolism (Correct Answer)

Explanation: ***Amniotic fluid embolism*** - **Lendrum's stain** (MSB - Martius Scarlet Blue) is specifically used to identify **fibrin**, **mucin**, and **squamous cells** in the pulmonary vasculature, which are characteristic findings in amniotic fluid embolism. [1] - This stain excellently demonstrates **fibrin** (stains red) and helps visualize components of amniotic fluid that embolize to the mother's lungs, leading to a severe, often fatal, obstetric emergency. [1] - Lendrum's method is particularly valuable in forensic pathology and autopsy diagnosis of this condition. *Air embolism* - Air embolism diagnosis relies on identifying **air bubbles** in the cardiovascular system, often confirmed by imaging studies or direct visualization during autopsy. [1] - Special stains are not typically used for direct detection of air in tissue sections. *Pulmonary embolism* - Pulmonary embolism, typically caused by a **blood clot**, is diagnosed by identifying **fibrin** and **red blood cells** within pulmonary arteries, often with stains like hematoxylin and eosin (H&E). [1] - While Lendrum's stain can demonstrate fibrin, it is specifically employed when amniotic fluid embolism is suspected, not for routine thromboembolic disease. *Fat embolism* - **Fat embolism** is diagnosed by demonstrating **fat globules** in the pulmonary microvasculature using **fat stains** like **Oil Red O** or **Sudan Black**, usually on frozen sections. - Lendrum's stain does not specifically highlight fat emboli. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 322-324.

Question 1376: Which feature best differentiates granuloma inguinale from lymphogranuloma venereum?

A. Response to doxycycline
B. Presence of buboes
C. Systemic symptoms
D. Tissue biopsy findings (Correct Answer)

Explanation: ***Tissue biopsy findings*** - This is the **best differentiating feature** because it provides **definitive pathological diagnosis** with pathognomonic findings. - **Granuloma inguinale** diagnosis is confirmed by biopsy revealing **Donovan bodies** (intracellular bacilli within macrophages seen as "safety-pin" appearance on Giemsa or Wright stain) - a pathognomonic feature [1]. - **Lymphogranuloma venereum** biopsy shows **stellate abscesses** with central necrosis surrounded by palisading histiocytes and granulomas, without Donovan bodies [2]. - Histopathology is the **gold standard** for differentiation, while clinical features can overlap [1]. *Response to doxycycline* - Both **granuloma inguinale** and **lymphogranuloma venereum** typically respond to doxycycline due to their bacterial etiology. - Therefore, response to this antibiotic does not help in differentiating between these two conditions. *Presence of buboes* - **Buboes** (swollen, painful inguinal lymph nodes) are a classic and prominent feature of **lymphogranuloma venereum** [2]. - While this is a differentiating clinical feature, granuloma inguinale can have pseudobuboes (subcutaneous granulomas mimicking buboes), making clinical assessment less definitive than histology. *Systemic symptoms* - **Lymphogranuloma venereum** frequently presents with **systemic symptoms** such as fever, chills, and malaise, particularly during the secondary stage with bubo formation [2]. - **Granuloma inguinale** is more often localized to the genital area with minimal systemic involvement. - However, systemic symptoms can be variable and are less specific than pathognomonic histological findings. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, pp. 378-379. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 504-505.

Question 1377: Which of the following cell death mechanisms can be initiated through both intrinsic and extrinsic pathways?

A. Necroptosis
B. Pyroptosis
C. Apoptosis (Correct Answer)
D. Necrosis

Explanation: ***Apoptosis*** - Apoptosis, or programmed cell death, can be initiated through either the **intrinsic pathway** (triggered by intracellular stress and mitochondrial dysfunction) or the **extrinsic pathway** (triggered by extracellular death ligands binding to cell surface receptors) [1]. - Both pathways converge on the activation of **caspase enzymes**, which execute the cell's demise in a controlled manner, preventing inflammation [1]. *Necroptosis* - Necroptosis is a form of **programmed necrosis** that is typically caspase-independent but involves receptor-interacting protein kinases (RIPK1, RIPK3) and mixed lineage kinase domain-like protein (MLKL) [2]. - It serves as a backup cell death mechanism when apoptosis is inhibited, often observed in viral infections or specific inflammatory conditions [2]. *Pyroptosis* - Pyroptosis is a highly inflammatory form of programmed cell death mediated by **caspase-1 (or caspase-4/5 in humans)**, often triggered by intracellular pathogens and danger signals [2]. - It involves the formation of a **multiprotein inflammasome complex** and results in cell swelling, lysis, and release of pro-inflammatory cytokines like IL-1β and IL-18 [2]. *Necrosis* - Necrosis is an uncontrolled and often **pathological form of cell death** resulting from severe cellular injury, such as ischemia, toxins, or trauma. - It is characterized by cell swelling, rupture of the cell membrane, and release of intracellular contents, leading to an **inflammatory response**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 64-67. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, p. 71.

Question 1378: What is a true statement regarding amyloidosis?

A. Beta-pleated sheets are present. (Correct Answer)
B. Amyloid is partially soluble.
C. It is occasionally associated with organ dysfunction.
D. Amyloid deposits are primarily intracellular.

Explanation: ***Beta-pleated sheets are present.*** - All forms of amyloid are characterized by the presence of **misfolded proteins** that aggregate into insoluble fibrils [1]. - These fibrils universally adopt a **beta-pleated sheet conformation**, which is detectable by X-ray diffraction and responsible for the characteristic staining properties of amyloid [1]. *Amyloid is partially soluble.* - Amyloid refers to **insoluble protein aggregates** that deposit in extracellular space [1]. - This **insolubility** is a key characteristic that makes amyloid resistant to enzymatic degradation and leads to its accumulation. *It is occasionally associated with organ dysfunction.* - Amyloidosis is inherently a disease characterized by the **deposition of amyloid fibrils** in tissues and organs [2]. - This deposition almost invariably leads to **progressive organ dysfunction** and eventual failure, making it a serious and often fatal condition if untreated [2]. *Amyloid deposits are primarily intracellular.* - Amyloid deposits are characteristically **extracellular**, not intracellular [1]. - The deposition of amyloid in the **extracellular matrix** disrupts normal tissue architecture and organ function, distinguishing amyloidosis from other protein misfolding diseases with intracellular accumulations [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 264-266. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 135-136.

Question 1379: Which of the following is not a feature of apoptosis?

A. Membrane blebbing
B. Inflammation (Correct Answer)
C. DNA fragmentation
D. Cell shrinkage

Explanation: ***Inflammation*** - **Apoptosis** is a programmed cell death process that does not typically induce an inflammatory response because the cellular contents are neatly packaged and cleared by phagocytes without spilling into the surrounding tissue [1]. - Unlike **necrosis**, apoptosis is considered a "clean" form of cell death that avoids triggering immune reactions [1]. *Membrane blebbing* - **Membrane blebbing** is a characteristic morphological change observed during apoptosis, where the cell membrane forms irregular buds or protrusions. - This process helps in the formation of **apoptotic bodies**, which are then readily phagocytosed [1]. *DNA fragmentation* - **DNA fragmentation** into nucleosome-sized units (180-200 base pairs) is a hallmark of apoptosis, mediated by **caspase-activated DNases** [2]. - This ensures the orderly breakdown of the genetic material as part of the cell's self-destruction program. *Cell shrinkage* - **Cell shrinkage** and condensation of the cytoplasm and nucleus are early and prominent features of apoptosis. - This reduction in cell volume occurs as water and ions are extruded from the cell, contributing to the formation of condensed apoptotic bodies. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 67-69. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 64-65.

Question 1380: A 60-year-old man presents with severe joint pain and swelling, and his uric acid levels are elevated. Which histological feature is characteristic of this condition?

A. Chondrocyte necrosis
B. Pannus formation
C. Tophi with needle-shaped crystals (Correct Answer)
D. Synovial hyperplasia

Explanation: ***Tophi with needle-shaped crystals*** - The presence of **tophi**, which are aggregations of **monosodium urate crystals**, is pathognomonic for **gout**, especially in cases with elevated uric acid and severe joint pain [1]. - These crystals often appear **needle-shaped** under polarized light microscopy and are surrounded by a **foreign body giant cell reaction** [1]. *Chondrocyte necrosis* - **Chondrocyte necrosis** is more characteristic of **osteoarthritis** or other forms of cartilage damage, where the cartilage cells die due to mechanical stress or degenerative processes. - While it can be seen in advanced joint disease, it is not specific to the **hyperuricemia** and crystal deposition seen in gout. *Pannus formation* - **Pannus formation** is a hallmark of **rheumatoid arthritis**, where inflamed synovial tissue invades and erodes cartilage and bone. - It is composed of aggressive **fibroblasts, macrophages**, and **lymphocytes**, and is distinct from the crystal deposits found in gout. *Synovial hyperplasia* - **Synovial hyperplasia** (thickening of the synovial lining) is a common feature in many inflammatory arthropathies, including **gout, rheumatoid arthritis**, and other conditions [1]. - It is a **non-specific** finding and does not differentiate gout from other joint diseases as effectively as **urate crystal deposition** [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1216-1220.

Practice by Chapter

Cell Injury and Cell Death

Practice Questions

Adaptations of Cellular Growth

Practice Questions

Accumulations and Deposits

Practice Questions

Acute and Chronic Inflammation

Practice Questions

Tissue Repair and Wound Healing

Practice Questions

Hemodynamic Disorders

Practice Questions

Genetic Disorders

Practice Questions

Environmental Pathology

Practice Questions

Nutritional Diseases

Practice Questions

Molecular Basis of Disease

Practice Questions

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free